Haha, the dreaded sitcom effect.

Directors play around with their film cameras to give better effects of motion and movement, and also to portray the gravity of a situation, like maxing the frames, forward cranks, variable speed cranking and so on. Frame interpolation is generally not intelligent enough to see where the director is using an effect to better portray a scene, blame unintelligent math lol. I used the Dark Knight as an example because it's quite evident in the Imax scenes.

Which reminds me.....i always wanted a specialized video processor that could read off a movie profile to tailor the processing for max enjoyment. Sad it applies only to games for now.